public parseRequestType()

in source/image-handler/image-request.ts [261:293]
31 lines of code
10 McCabe index (conditional complexity)

  public parseRequestType(event: ImageHandlerEvent): RequestTypes {
    const { path } = event;
    const matchDefault = /^(\/?)([0-9a-zA-Z+/]{4})*(([0-9a-zA-Z+/]{2}==)|([0-9a-zA-Z+/]{3}=))?$/;
    const matchThumbor = /^(\/?)((fit-in)?|(filters:.+\(.?\))?|(unsafe)?)(((.(?!(\.[^.\\/]+$)))*$)|.*(\.jpg$|.\.png$|\.webp$|\.tiff$|\.jpeg$|\.svg$))/i;
    const { REWRITE_MATCH_PATTERN, REWRITE_SUBSTITUTION } = process.env;
    const definedEnvironmentVariables = REWRITE_MATCH_PATTERN !== '' && REWRITE_SUBSTITUTION !== '' && REWRITE_MATCH_PATTERN !== undefined && REWRITE_SUBSTITUTION !== undefined;

    // Check if path is base 64 encoded
    let isBase64Encoded = true;
    try {
      this.decodeRequest(event);
    } catch (error) {
      console.error(error);
      isBase64Encoded = false;
    }

    if (matchDefault.test(path) && isBase64Encoded) {
      // use sharp
      return RequestTypes.DEFAULT;
    } else if (definedEnvironmentVariables) {
      // use rewrite function then thumbor mappings
      return RequestTypes.CUSTOM;
    } else if (matchThumbor.test(path)) {
      // use thumbor mappings
      return RequestTypes.THUMBOR;
    } else {
      throw new ImageHandlerError(
        StatusCodes.BAD_REQUEST,
        'RequestTypeError',
        'The type of request you are making could not be processed. Please ensure that your original image is of a supported file type (jpg, png, tiff, webp, svg) and that your image request is provided in the correct syntax. Refer to the documentation for additional guidance on forming image requests.'
      );
    }
  }